Small centring tip, pre-cutter and 2 main cutting edges on the hinge drill bit, WS version in uncoated softwoods, Bormax® geometry in veneered boards and conditionally KS-coated chipboard or MDF, HM in KS coating without problems, all versions only conditionally suitable for freehand use, the guide sleeve of the "Zenterfix" hinge drill bit centers itself in the screw hole of the hinge or fitting, the Zenterfix is equipped with spring-loaded guide sleeve and core drill bit in HSS with roof tip